/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/ModelingEditorUI/Public/ModelingWidgets/SDraggableBox.h
Users probably shouldn't use this class directly; rather, they should useSDraggableBoxOverlay, which will put its contents into a draggable box and properly handle the dragging without the user having to set it up.
class SDraggableBox : public [SCompoundWidget](API\Runtime\SlateCore\Widgets\SCompoundWidget)
TSharedPtr<SWi...
InnerWidget
FOnDragComplete
OnDragComplete
FVector2D
ScreenSpaceOffsetOfGrab
Remembers the point in the box that we grabbed (on click, rather than when the drag was confirmed)